Offline webservice documentation.

[phxql]

At the moment the server must be running to get the webservice documentation. Maybe we can host the documentation on a Github page or something like this?

[phxql]

If we find a way to generate the documentation at build time, we can remove the dependencies on Scala (which are ~25 MB).

[phxql]

Take a look at this: https://github.com/RobWin/swagger2markup